If puncher inventory is full, then drop boat

Rename in game.conf and documentation
Update game_api.txt documentation for bucket API and tree functions
Fix tab, space and comment formatting in game_api.txt
Rename in mod READMEs

By CProgrammerRU
Also, by paramat:
Slightly raise base of collision box
Improve code style

Boats mod improve y motion. Smaller collision box. Reverse turn with negative velocity only. Smooth turning. Enable underwater higher acceleration

Add spaces around operators in boat mod code, fix a problem with boat staticdata, fix a crash that can occur with boat going over unknown nodes.